Helmshohe



Jan. 27, 1931. F. WEMPE ET AL 1,790,396

BOILER IN WHICH THE STEAM IS GENERATED INDIRECTLY ,Filed Oct. '7. 1927 2 Sheets-Sheet 1 l-b i i 000000 0 O00 OO OLOOOOOO INRICH PEPERKO m Jar n. 27, 1931. F. WEMPE ET AL 1,790,396

BOILER IN WHICH STEAM IS GENERATED INDIRECTLY Filed 001;. 7. 1927 2 Sheets-Sheet 2 0 000 0A0O000D 000000 Fmenemw WEMPF:

' Patented Jan, 27; v193i UNITED, STATES PATENT. OFFICE FRIEDRICH HEINRICH PEPEBKORN, OF CASSEIa-WILHELMSHOHE, GER- MANY, ASSIGNOBS TO SCHMIDTSCHE HEISSDAIPF-G.'H. 3.11., 01 CASSEL-WIL- HELISHOHE, GERMANY, A CORPORATION OF GERMANY BOILER IN WHICH THE STEAM IS GEIVEBATED INDIBECTLY Application filed October 7, 1927, Serial No. 224,690, and in Germany November 8, 1926.

Our invention relates to boilers in which the steam is generated according to the indirect method and is specially suitable for those working with pulverized coal.

5 In known forms of boilers using pulverized coal, the steam is generated according to the direct method, such boilers 'in general being constructed by the simple addition of a combustion chamber'to the boiler proper. These 9 boilers, however, occupy considerable space and in particular they are of great height as in most cases the flue leading from the combustion chamber is vertical and is arranged either directly above or above and to one side 15 of the combustion chamber. 0

l 20 With such an object, thepresent invention consists in a boiler generating steam according to the indirect method, in which the heatreceivingsurface of the heat-carrier tube sys-' tem' isdivided into two juxtaposed parts, of which'the one part, which is preferably arranged to form the side walls, rear wall and roof of the combustion chamber, receives heat by radiation while the other part receives heat b contact with thehot gases and is arrange in a horizontal "flue connecting the combustion chamber to a vertical flue in which are disposed a steam superheater, a feed-waterheaterand preferably also an air preheater.

above this chamberfand above'the horizontal flue issuing therefrom. The space -beneaththis horizontal flue is preferably formed as a passage to provide access to the individual Due to the new arrangement of the heatevaporating or preheating systween the horizonta flue and the vertical flue a cooled bridge in connection with which a damper is provided for regulating the passa e of the hot gases to the superheater.

In the drawings, one formof the improved boileris shown by way of example.

Figure 1 is a longitudinal section through the boiler on the line I-I ofFigure 2, while Figures 2, 3 and 4 are respectively cross-sec tions on the lines II II, IIIEIII and IV- IV of Figure 1.

According to the form illustrated, the brickwork, 1, of the boiler designed for burning pulverized coal, surrounds a burner chamber, 2, connected by way of a combustion chamber, 3, to a horizontal flue, 4, and a vertical flue, 5; air inlet openings, 6, being provided in the front wall of the burner tem to the water in the drums. The serpen- I tines, 9, are connected by distributor or 'col lector headers, 10, to the heat-receiving tubes of the heat-carrier system, these heat-receiv 1ng tubes. being divided into two parts of which one receives heat by radiation, the other by contact with the hot gases. The part receiving heat by radiation is formed by tubes, 11, which are arranged to'form the s1de walls, the rear wall and theroof ofthe combustion chamber, while the part in contact with the hot-gases is formed by the tubes, 12, lying nthe horizontal fine, 4, issuingfrom the combustion chamber, 3'. The tubes, 11, which are in two serieslying adacent to the rear wall, 13, of the'combustion chamber asshown in Figure .3, are bent into staggered zigzags reversely disposed in relation to one another so as to cover the rear wall, 13, as far as possible. The tubes 12, lying in the horizontal flue,- 4, are also bent into zigzags slmilarly disposed in relation to one another so as to take full advantage of the eddying of the combustion gases from the point of view of eflicient heat transference.

Below the burner chamber, 2, and the combustion chamber, 3, is arranged a cooled grid, 14, which by the tubes, 15 and 16 is connected with the serpentines lying in the upper this passage providing access to the tubes of the feed-water heater, 18, and to the collector header, 21, to which the tubes, 14 and 16, are connected.

For regulating the temperature of superheat a damper, 22, can be moved in the vertical direction to any given position. A bridge, 23, which is preferably cooled and may consist of brickwork, lies between the flues, 4 and 5, so that with the-damper, 22, in'the limiting position shown in full lines in the drawings, all the hot gases pass through the superheater, 17, while in the other limiting position shown in chain lines, only a small part of the gases flows through the superheater.

Both in the combustion chamber, 3, and in the horizontal flue,' 4, a part of the waterheating surface. if desired, may be replaced by superheater-heating surface.

It will be seen from the drawings that the boiler described forms an, organic whole and is of a comparatively small height, these characteristics and also the advantages of the indirect method of steam generation distinguishing it from boilers of other kinds using pulverized coal.

Although a specific form of the improved boiler has been described for the burning of pulverized coal, it will be seen that its main characteristics with corresponding advanta ges may be readily applied to the burning of oil or again to the burning of coal on a grate in the ordinary manner.

I claim:

1. In a steam generating plant, a furnace construction comprising a-combustion chamher, a vertical flue having at least two superposed heat receiving units disposed therein, a horizontal flue connecting the combustion chamber with the vertical flue, a plurality of heat receiving tubes within the combustion chamber, said tubes being arranged to form the side walls, rear wall, and roof ofthe coni-.

bustion chamber and thereby receiving heat.

mainly by radiation, a. plurality of tubes arranged in said horizontal flue and thereby receiving heat mainly by contact with the hot gases of combustion, and a substantially vertical damper member disposed between the horizontal and vertical flues, said member being, vertically adjustable to cause the hot gases to pass either over or under said member and being arranged for movement at a height substantially corresponding to that of the upper heat receiving unit.

2. In a steam generating plant, a furnace construction comprising a combustion chamber, a vertical flue having at least two superposed heat receiving units disposed therein, a horizontal flue connecting the combustion chamber with the vertical flue, a plurality of heat receiving tubes within the combustion chamber, said tubes being arranged to form the side walls, rear wall and roof of the combustion chamber and thereby receiving heat mainly by radiation, a plurality of tubes arranged in said horizontal flue and thereby receiving heat mainly by contact with the hot gasesof combustion, a transverse, horizontal bridge lying between the vertical and horizontal fines and spaced from. the upper and lower extremities of the vertical flue, and a damper member vertically adjustable to cause the hot gases to pass over orunder said bridge and being arranged for movement at a height substantially corresponding to that of the upper heat receiving unit.

3. In a steam generating plant, a furnace construction comprising a combustion chainber, a vertical flue, heat absorbing elements in said vertical flue, a horizontal flue con meeting the combustion chamber with the vertical flue, a plurality of heat receiving tubes within the combustion chamber, said tubes being arranged to form the side walls, rear wall, and roof of the combustion chamber and thereby receiving heat mainly by radiation, and a plurality of tubes arranged in said horizontal flue and thereby receiving heat mainly by contact with the gases of comtures.

FRIEDRICH WEMPE. HEINRICH PEPERKORN. 

